You simply forgot that Windows 32 bit limits applicaiton space
to 2GB.
It does NOT matter how much you have RAM or page
file,
as long as you run 32 bit app / windows , the application
addressable space is 2GB
(or 3GB if running /3G switch in boot.ini)
There is simply NOT enough memory.
1.25GB is size ON DISK.
In memory you need way MORE because you need space not
only for data,
but also for AFL arrays.
Not to mention that Windows usually DOES NOT have that
much
CONTIGUOUS memory available.
Use 64 BIT WINDOWS and 64 BIT VERSION of AmiBroker instead
or ... reduce amount of data if you want to use 32 bit
win/app.
By the way, this:
In-memory cache size (max. symbols): 20000
is completely over the roof.
Set it to 11 if you want to use very long intraday histories, then
AmiBroker
will flush unused symbols out of RAM.
And ALWAYS the latest (i.e. 5.25) as it uses less
memory.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
Sent: Friday, May 08, 2009 12:21 AM
Subject: [amibroker] AB Crashes when
switching symbols
Recently
I built up my database to include 12 Forex pairs with historical 1-min data
going back 10 years or so on each symbol. The total size of the database is
only 1.25 GB, which does not seem too bad.
The problem is that when I
switch charts from one symbol to another, I notice that mem usage in windows
task manager indicates that AB (Broker.exe) keeps growing by 150mb or so, each
time I switch symbols, and does not go down. If I switch symbols 6 or 7 times,
AB finally crashes.
This is especially cumbersome when I want to
Merge each symbol with the latest weekly historical data. After merging a few
symbols, AB crashes.
I am running WinXP on a dual quad-core with 8GB
RAM, with allowable page file up to 25 GB. The crashes happen on AB 5.24 and
5.25. I imagine the same thing would happen on 5.20 but I have not reverted
that far back.
In AB, I have the following set in
Tools--> Preferences --> Data:
In-memory
cache size (max. symbols): 20000
(Max
MegaBytes):
1000
Number of bars to
load:
100
AB does not allow me to set max. symbols to any less than
10. I imagine if I could set that to 1 or 2, that would keep the cache
sufficiently low in terms of memory usage.
So the question is - what
settings do I need to set, in the Data tab or other tabs, in order to ensure
less memory usage to avoid crashes? Again, I only have 12 symbols in the
database, and I imagine many users out there have far more than
that.
This problem is preventing me from trading more than a couple of
symbols at a time, without running into crashes.
Any feedback greatly
appreciated.
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